MARK E RASSIER MD
NPI 1063514164
Internal Medicine - Nephrology in Minocqua, WI
About Mark E Rassier Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK E RASSIER MD (NPI 1063514164) is an individual nephrology provider in Minocqua, Wisconsin, licensed in Wisconsin (36111) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mark E Rassier Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mark Rassier reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54548 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MINOCQUA, WI 54548
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Rassier's NPI number?
The NPI number for Mark Rassier is 1063514164. It was assigned to this individual provider in the NPPES registry on September 1, 2006.
Where is Mark Rassier located?
Mark Rassier practices at 9601 Townline Rd, Minocqua, WI 54548. The listed phone number is (715) 358-1000.
What is Mark Rassier's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Mark Rassier enrolled in Medicare?
Yes. Mark Rassier is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mark Rassier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Rassier reassigns Medicare benefits to Marshfield Clinic Inc (Marshfield, WI). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Rassier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Rassier was last updated on July 30, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mark E Rassier, MD · NPI 1063514164
Nephrology physician in Minocqua, Wisconsin. Individual provider, active in the CMS NPPES registry since September 1, 2006.
## Identity
- **NPI:** 1063514164 (Entity type: Individual)
- **Enumerated:** September 1, 2006
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** 36111 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 9601 TOWNLINE RD, Minocqua, WI 54548
- **Phone:** (715) 358-1000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Marshfield Clinic Inc (NPI 1952347981, Marshfield, WI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 30, 2007
- **Other identifiers:** Medicare UPIN E63801; Medicaid 32091900 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1063514164) · Data from the CMS NPPES public registry.